/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineIdentityInterface.h
This struct will be broadcast with the FOnControllerPairingChanged event. This event is not broadcast on all OnlineIdentity platforms. There will be a struct for the previous user on the controller and for the new user on the controller.
struct FControllerPairingChangedUserInfo
int32
ControllersRemaining
The number of controllers now associated with User. If User is nobody, this number will be 0
constFUniqueNe...
User
One of the users involved (the one who had the controller or the one who now has the controller).